The arachnoid villi absorb excess cerebrospinal fluid, or CSF, that collects in the venous sinuses surrounding the brain. Acting as one-way valves, the arachnoid villi, or arachnoid granulations, help to ensure that the ... More »

Intestinal villi are small, finger-like projections that protrude from the walls of the small intestine. The villi increase the absorptive surface of the intestine and ensure efficient absorption of nutrients. The villi ... More »

The primary function of the villi in the small intestine is to increase the absorption of nutrients from food passing through the small intestine. Intestinal villi are small thread-like objects that line the intestines i... More »

The cerebral aqueduct, or "aqueduct of Sylvius," connects the third and fourth ventricles providing a conduit for cerebrospinal fluid (CSF) to flow inside the brain. This aqueduct is located in the midbrain and forms par... More »

The function of the foramen magnum is to allow nerves, blood vessels and fluid to pass in and out of the brain. The foramen magnum is a large hole at the base of the skull. More »

When spinal fluid leaks out, there is a drop in the pressure around the areas of the spinal cord and brain according to MedlinePlus. Fluid leakage can also cause symptoms, such as fluid drainage from the ears. Spinal flu... More »

Cerebrospinal fluid is a clear, colorless fluid found in the subarachnoid spaces in the cranial cavity, where it functions as a shock absorber for the delicate tissues of the brain, according to Fluids and Barriers of th... More »